Abstract: An upstanding tubular shank is provided and the lower end portion includes a tapered lower terminal end and a lateral opening formed therein closely spaced above the terminal end. A hollow poison reservoir is carried by and encircles a midportion of the shank intermediate the upper and lower end portions thereof and the midportion of the shank includes a lateral port opening into the interior of the reservoir for gravity flow of fluent poison material from the reservoir into the shank midportion and subsequent gravity flow downwardly through the shank into the lower end portion thereof and toward the lateral opening therein. A rotary valve member is oscillatably supported in the lower end portion of the shank and a valve actuator is oscillatably supported from the upper end of the shank.